Improvement in steam-boilers



Nrrnn TATns ATENT OFFICE.

WILLIAM M. ELLIS AND JONAS B. ELLIS, OF WASHINGTON, DISTRICT OF COLUMBIA. f

IMPROVEMENT IN STEAM-cousus.

Specification forming part of Letters Patent No. 369288, dated August 26, 1862.

.To all whom, t may concern:

Be it known that we, WILLIAM M. ELLis and JONAS B. ELUS, of the city of Washington, in the District of Columbia, have invented a cer tain new and useful Improvement ou Steam- Boilers; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters and marks thereon.

In the horizontal tubular steam-boiler, where the tubes are liretubes, there is a tendency to priming.77 One of the causes of this tendency arises from the disposition of the heat and the products of combustion to pass up from the iire-box or from the rear chamber in the return-line boiler to the upper rows or series of tubes, so that the largest amount of heat passes into the upper portion of the water in the boiler. Another cause of this tendency is found in the want of proper communication between the water-legs and the main part or body 0f the boiler.

Our invention relates to means for remedying this tendency of the boiler to priming, and these means have reference to the due distribution of the products of combustion 7 into the tubes and the connecting of the water-legs to the shell of the boiler at that point or line which will secure proper circulation of the water.

Figure l of the drawings forming part of this specification is a viewby longitudinal sec tion of a horizontal tubular boiler, and Fig. 2 a View of the rear or back end of such section.

In each of these figures where like parts are shown like letters and marks are used to indicate the parts.

It will be seen that the heat and products of combustion from the lire-box or furnace a of this boiler will pass through the iiue b to the chamber c, and thence through the tubes d to the uptake c and stack f.

In order to prevent the products of combus tion from following the natural track-z'. c., passing freely into and through the series of the upper tubes-as they would were the tubes throughout of the same area, we make the tubes of a gradually-increasing area from the upper to the lower tubes, and thus interrupt the course of the heat and products, forcing them to pass to a greater degree than they otherwise would to the lower tubes, which, being of greater area, the more readily admit the heat and products of combustion. The heat is therefore more regularly and equably disposed throughout the Water and the tendency t0 free and more rapid ebullition near the surface of the Water prevented.

The advantages derived from this improvement will accrue in all boilers of horizontal fire-tubes, whether director return.

The water-legs g of this boiler, as is shown by the drawings, extend continuously from front to rear and have communication with the body of the boiler by a series of openings, h, through the shell of the boiler or through a plate connecting the flanges of the legs with the shell at the working watenline ofthe boiler. Now, it will readily be perceived that by having these openings h at this line there will be at all times ap art of each opening unoccupied by the water, which will not only allow of the passage of steam from the legs to the boiler under ordinary cireumstances,but Whenever excessive ebullition occurs, as in priming or in foaming, these openings will permit the flow of the steam through them from the boiler, and thus act as outlets to relieve the violent agitation of the water in the boiler. By having these openings at the working waterline of the boiler, We therefore not only make provision for the circulation of the water from the legs to the boiler, or vice versa, but we also make an excellent provision for the relief of priming, if not for its prevention.

What we claim as our invention, and desire to secure by Letters Patent, is

1. Connecting the water-legs,extending con# tinously from the front to the rear of the boiler, to the shell of the boiler at the point of the working water-line of the boiler, substantially as herein set forth.

2. Gradually increasing the area of the tubes from the highest to the lowest tubes, as described.

WM. M. ELLIS. J. B. ELLIS.

Witnesses:

J. D. CLARK, S. GOLDIN. 

